Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd80f2d0c8a68f9b147db4ffc4948a10f582a409af46a163723e7e92f24a4b5f' 
  AND token = 'mATz0EVXyIoChANPuomYvq0Rji92Ak45WOLZv9fOgFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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