Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8a3dbc5245316226eb1e6befeb3ef17718e00cc0a54ddc62179a2ddbde594c4' 
  AND token = 'n9V756G8cwtgDUi0drct2B2WPRTPdyW+fLVgsYuLtT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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