Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe3288da3fdfaaad6009961f71f0d7c5464f6c6dc6de1a85630e38082f75f5f8' 
  AND token = 'cFzxpeYrcAyeL+MqTAt9DvKQWnXutjFL906M4F9npv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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