Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a05f08109524593522cc12423848018f5e3d0b565d55e0631d297e34f1469c3' 
  AND token = 'DQZgtptYJFAdQOVVERsrlcRt3XlBlvAxinVPqQJz84M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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