Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4cd3faea70d0bbaee952439a01c904ba989a00cdcbb2f25f2b9a7ba65e0e9d2' 
  AND token = 'LLeopXFy/wN0P+d6VnP9YA7bh/qPp1lVm/DjT25NYlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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