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You can set the expiration time using the expire method in the Python Redis module. Here's an example:

import redis

# create a Redis client
redis_client = redis.Redis(host='localhost', port=6379, db=0)

# set a key-value pair with an expiration time of 60 seconds
redis_client.set('my_key', 'my_value', ex=60)

# get the value of the key (this will work only within 60 seconds)
value = redis_client.get('my_key')
print(value)

In this example, we set a key-value pair with the ex parameter set to 60, which means the key will expire in 60 seconds. After setting the key-value pair, we retrieve the value using the get method. If we try to retrieve the value after 60 seconds, it will return None because the key has expired.