The keys do not change yearly - the subscription renews for the same key.
Have you actually renewed/repaid your subscription?
If your key is showing as ‘Expired’ then it appears not to have been renewed.
Exactly when did you purchase your licence subscription, was it Feb/March 2024?
Just to check though - it is saying your licence key is ‘Expired’ or does it say’Invalid’?
In CCleaner>Options>Licence Key what does it say for ‘Product Status’ and what date does it show for ‘Expiry Date’
You can raise a support ticket by using the form here: CCleaner Support Community
You can also contact CCleaner support by emailing: support@ccleaner.com
Be aware that support can be very slow, it may be a week or even more before you get a reply from an actual support person.