Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '633562ac210056713936b6e9b515d66e7a21a40c2387b7a189787711fedc13af' 
  AND token = 'X4/srKIWLXXOr91zpYI3RQjr10gTFf387yToUGk+uiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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