Thanks for the token. It does not expire and do not require CPEs unlike CCSP. Think of CCSP as a CCSK superset. See https://cloudsecurityalliance.org/blog/2018/04/24/ccsk-vs-ccsp-unbiased-comparison/
Supposedly, the CCSK was designed to dovetail into the material covered by the CCSP, so they are complimentary certs. People with both have recommend doing the CCSK as prep for the CCSP. If you are trying to impress people with Cloudy acronyms then it can't hurt to have both on your resume.