Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8566c5fddabf028b51c60beac07e2a800649682990d481463e2ded5744ffb68' 
  AND token = '3vnJt/rqu+WybtWF4S8igMeHuAQL/Tt1Lh5jPlETJt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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