Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'befcf27df026f52d319e5da2eef6649a68cdafb48a70b096ae86afaf45e368c7' 
  AND token = '50VDevus4HWCEBUPOpErYFEGPdB3qRV/aCpSMQJdU5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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