SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1522bfc0ec620b03cbe07c62706c2f9c111251ad89809ba91704e22439e6ddae' 
  AND token = 'UqKqQeX2+vhemJmqM+yHbBrpEMpHQyISAjKSSQ5ZvxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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