SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '734b32ef766dbd1b32a66d873bd3f5948e9192586a58cdfc6d908a4e80f1e5e4' 
  AND token = 'tRz+5IkB8umnpTN5Z7MU9wKVZvDfD8qAi7cko0wwduw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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