SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'f5cd78e82c4d53a9033095fde9791225aa6a5461ff3d4068eea564abddbf5bef' 
  AND token = 'KEVF1pJC6mOLyHm/nlJxIXwGUTtPbPQeEYlcXvT5MK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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