Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12fec8fef2a2544a558a8f1ef7a5338e37026f9b200ecff315b94c272ed557c1' 
  AND token = 'dnjVCEkOQy0yprrjVAf2UcC8vza+eSWQdNQI+qUe4Po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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