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Query performance can be enhanced when using Spring Data JPA and MySQL with a datetime column that requires sorting by following these methods:

1. Indexing: Creating an index on the datetime column will improve query performance. By indexing the column, the database can quickly locate the rows based on the date/time criteria used in the WHERE clause.

2. Pagination: Pagination can be used to limit the number of rows returned, which reduces the amount of time taken to sort and retrieve the data.

3. Projection: Only selecting the required fields in the query projection can reduce the amount of data that needs to be sorted, resulting in faster querying.

4. Query Optimization: Optimizing the query can improve query performance. This can include refining the WHERE clause, using subqueries where appropriate, and using the correct join type.

5. Caching: Caching the query results can improve performance as the data can be quickly retrieved from the cache rather than re-executing the same query repeatedly. However, data should be invalidated from the cache when it is updated.

6. Sorting Criteria: Sorting on a smaller dataset can be faster. For example, sorting on the month instead of the entire year can yield better performance.

By implementing these methods, query performance can be enhanced when using Spring Data JPA and MySQL with a datetime column that requires sorting.