Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a426fb754728737d70922b80a04e0118ceac52e3595ca9b184b93ae05517530f' 
  AND token = 'LGAa19y3UlabKRF2Anczh+OMQ+tuKfNnlwqJjJJdai8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}