Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6143bd6f751d76f787524b7ed96a8549d7d29f86e5fe4ba8fe6db9c999697770' 
  AND token = 'RMLtkupGwUKz2ZJYe37UAdUhYnzFhBU7X2VT+9Fdets=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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