Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5ee2d81bdf8179ecfd3c1c0a41f5d9689eae5e16c7b8299b61f2e5ddf4c8a92' 
  AND token = '71H2+dcFRwa7UV33BM3ycM3uJ2NKYnZ6Ra2loiopjeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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