Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '139e4eb0492d4a3540ee542f11c8fd8e9fd8cc7d34cc09d115891657f5e31490' 
  AND token = 'P7RW5FkSjirO6HNY+SwhpjuOUVQ6RiuUy8Q7hhemG7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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