SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0913febdc1cf0b5142a2823550efdc15187943e21e97a4b5848220b98426f725' 
  AND token = 'ceqoTzbxhxeQnkuVOUo0jPZM4K8YY29NSVSUmkw/hto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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