Add

Adding constraint NetAppToken composing of 3 columns: network, application, token.
Note: you supposed to have chosen a right db:
use <database_name>;

ALTER TABLE crypto   
    ADD CONSTRAINT NetAppToken UNIQUE (network, application, token);

View

SELECT 
   table_schema,  
   table_name,    
   constraint_name
FROM information_schema.table_constraints
WHERE table_name = 'crypto';

Result

+--------------+------------+-----------------+
| table_schema | table_name | constraint_name |
+--------------+------------+-----------------+
| admin_crypto | crypto     | PRIMARY         |
| admin_crypto | crypto     | NetAppToken     |
+--------------+------------+-----------------+
2 rows in set (0.06 sec)