Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be50e3a2776ae746abf260adb28e5475748571b79bdb64838f8ffbc1017422e3' 
  AND token = '7ShEB3yoKpNJrhiTdrhfXTxKeVQiz/fLCdSXLOIhb4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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