Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f7c97fe645fb5bd2ed20aadc193e3384fa1fb4c879f6d509e46e88c4de28a4e' 
  AND token = 'WXisSIWWYT6aiIx7hlT66xpgyXi0NAfE0KhaF9GHMFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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