Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '401170263e9d065a458f358e2bed106a18d4aded4fd9c802f19baf65784885c9' 
  AND token = 'VB0okb1/un36ndNeIkHTf3BjkTrmH7zzuk2IajVMhSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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