Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7903777bae9edca7b93a41cd2f1882bb2aff8e2bb07bb010944d94f41b6bdf19' 
  AND token = 'UbhuQfFsfR4SUmJ13xpX9y5UxXvCP1SfQMH7qXZwvuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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