Setting timestamps to false means you are going to lose both created_at and updated_at whereas you could set both of the keys in your model.
Case 1:
You have created_at column but not update_at you could simply set updated_at to false in your model
class ABC extends Model {
const UPDATED_AT = null;
Case 2:
You have both created_at and updated_at columns but with different column names
You could simply do:
class ABC extends Model {
const CREATED_AT = 'name_of_created_at_column';
const UPDATED_AT = 'name_of_updated_at_column';
Finally ignoring timestamps completely:
class ABC extends Model {
public $timestamps = false;