Aren’t they?
mysql> SHOW INDEX FROM cel;
+-------+------------+----------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+
| Table | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment |
+-------+------------+----------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+
| cel | 0 | PRIMARY | 1 | id | A | 127670 | NULL | NULL | | BTREE | |
| cel | 1 | uniqueid_index | 1 | uniqueid | A | 63835 | NULL | NULL | | BTREE | |
| cel | 1 | linkedid_index | 1 | linkedid | A | 25534 | NULL | NULL | | BTREE | |
| cel | 1 | cid_num_index | 1 | cid_num | A | 227 | NULL | NULL | | BTREE | |
| cel | 1 | exten_index | 1 | exten | A | 4 | NULL | NULL | | BTREE | |
| cel | 1 | context_index | 1 | context | A | 4 | NULL | NULL | | BTREE | |
+-------+------------+----------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+
6 rows in set (0.24 sec)