Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87a87d6ff45533815d54eaf413ab38e46a638157882f261e5c9b9a43c5fa9c21' 
  AND token = 'TUsfvEp8L0p4TBOlBjCXlg7IxwNc50tXAnATy8LLzRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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