Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74cab5ac0d94b775ef4ee4a3ea6477c7b6adf0900f8d4b455ceb3095724e4424' 
  AND token = 'udrxGkaNJ5NRoCHmxZAJ9Awh5lTm5ynbl/GtqC8uCtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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