Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fcf3c1a218439fba4d5103958289d8fbbe9872975e674c801c50e977b14f0fc' 
  AND token = 'vnca9bOGI7FIfW9RgigYZn7VVBPsuxzQZntlek976E8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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