Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ad90cc093de1703b4f63d84577980f58ab034a9f8bee0f1452346468c540481' 
  AND token = 'tax8/ptxnNqnl2AmFm1DWjnRFS8AszM4MuAwfnPshDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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