Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d2ab87ad111ec843a92648bc14d5364d0b4aa82b70242220e08058216373332' 
  AND token = '/jcVOiSXCiKuFgLRH6sEf1KZ1rAHMxF2osou5z0N3u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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