Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '151ad0ac02a2f93dee3e92fa54cc594d4883bca96bf0b11bc4e6421ae31a47c7' 
  AND token = 'VGKj/tcSctJ6Z0/dm/SJkX7tWSbs4yHf5dCX9qJ8lB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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