Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '603aeb7c0c35e59c13cd0cb3589703fa167fe608e58a8a5b9e30515d024740f8' 
  AND token = '3qtc4/qUECBtDVvdZACquXtAUgOtBPIrhscppkdxyQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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