Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e9fdf03da20a6e1e314e5f8f5c695d9c6ffb56f7df78e60d64ea6c840d518ba' 
  AND token = 'Jw2Ndh+Tq8clnruO8Je/TpV3Xy+zb9kbtYnoafNUO3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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