Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ac5faa0cb5ddf6d06a384e7d3c659e7503019f0dcf31ee41f576b68ed5a4b0' 
  AND token = 'RVn7Dh0BUFQu5xsK9DdohAGy/FsZa/QrBpOrf9gFAsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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