Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '835115a477495cd2c2b8715891613b04f1c1e6e2ff1232235bbb6fdd43ca29a7' 
  AND token = 'dz7UFYQr85Bx19+YNJNDpwE7NvwusnFGcqPqG1A16SA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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