how to clear AWS key caching on Mariadb.

hello, I'm new to MariaDB and I'm testing the plugin for aws_key_management feature and I'm running into some issues I'm doing a test case to enforce key rotation however it seem that the key is being caches on mariadb. when I changed the aws-key-management-master-key-id variable to different key, the db still loads the old key even the key was put as an invalid name. Doe any one know where or how I can could clear the key cache on Mariadb to force it use the new/rotated key? any advice would be great. Thank you.