Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '398d39bdfeb0ca74265d5349c67baa8a2b3323b8ee3f279dc09ff3f473616eb7' 
  AND token = 'xNUcAhUvEhF2/7QpIE/t5pnLgkbdl6GUGuI7NvH1hYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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