Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '818e94bf49f0616afdf9a696628ded3dc7fbdf750d806e4924b437ebc1d483ca' 
  AND token = '9EKd6sYiESQeRxQRHhMQsF21R850JsgDtLvIJqP+Jg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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