Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e5ef8e1bdee89f42524869de6624cbf16c0cfdde1b7f6eb46a81740d69fb586' 
  AND token = 'KhfgBk+MicGQOEbzLeFDp8e6bAkxdXggjCvHXWPWzyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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