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Here are the steps you can take to resolve the key error while attempting to establish a connection with the MySQL database:

1. Check the key value: Check the key value you are using to connect to the MySQL database. Make sure that the key exists and is correct.

2. Verify your connection details: Make sure that the hostname, username, password, and port number provided are correct. Check if there are any typos or errors in the connection details.

3. Check if the MySQL server is running: Check if the MySQL server is running and accepting connections. You can use the command "service mysql status" to check if the MySQL server is running.

4. Check if the database exists: Check if the database you are trying to connect to exists. You can use the command "show databases;" to list all the available databases.

5. Check if the user has the necessary privileges: Check if the user you are using to connect to the MySQL database has the necessary privileges to access the database. You can use the command "show grants for 'user'@'localhost';" to see the privileges for the user.

6. Check the firewall settings: Check if there are any firewall settings that are blocking the connection to the MySQL database.

7. Restart your MySQL server: If all the above steps fail, you can try restarting your MySQL server to see if it resolves the key error.

By following the above steps, you should be able to resolve the key error and establish a connection with your MySQL database.