Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fd2bb1e73778586fc110370c2faa64e4acdd5c939e5a7d652586b85202ac7b60' 
  AND token = 'WVecQFaF2kGU+Dc2MVTI2QAy9ypJio4WRD7oFK0i9+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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