Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '458347cbc729280bc34c172196732bcd8a61c783ae3e624157e0247813c30c46' 
  AND token = '4X5s6H1eRsayEEFYa4jiRIh3VpoxVCM0lwIpHZyMeaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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