Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2611d824d6d81fffc6f9551a5d2828a0ec6250c0bc4dd1d923b1f7ac7520cd0c' 
  AND token = '8oGo1dyEeaOWR/EAwbtzFXmHR9OZnL2dZA3/2Y43uVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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