Cant Drop Foreign Key On Existing Table?

I'm trying to drop the foreign key to an existing table using migration but it throws an error as "Syntax error or access violation:1091 cant DROP consultant_id :check that column/key exists". Can you please help with it?

First of all, you have to drop Foreign constraint.

public function up() {
       Schema::table('table_name', function (Blueprint $table) {
            $table->dropForeign('table_name_consultant_id_foreign');
            $table->dropColumn('consultant_id');
        });

    }