Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ef870dd4990ca3cb46295a9f899d8c8ca8b02a89a4cd7d83394e9a541fed225' 
  AND token = 'FOL8WOyR4E4HUXQxdDcQIs6XcY6fCGsmDYMd4vIOkjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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