Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db0211cd5adb8468e657b986d65c26ad4d9efd92219fa232802bb36bd409a5c6' 
  AND token = 'MKuX7cFZ/TXdURN7xexNEsx/IZ/m8BjX/SA8gVsdY+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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