SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2e7e9917f44e3e702a46c0c0f3cd336bb7685050f948be8a6ea774da99858f93' 
  AND token = 'ACj85fTY20JycMKOvvE5ZaNp9f/Oo9tvVph+FllxUEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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