Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b199615687e8bf844a85bb70b2597794bceefb25a9169e2eb2a4070faec4d72b' 
  AND token = 'Cz2DmreTEDD88zaqajNOxXkImzVAgAiaBc/VsFrkVi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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