Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67d487a319e244163ac50e32c2382f4d71973b079eb7fd015fb90a08e464dbf2' 
  AND token = '0U9ojfEWaicAugefVcGSrMwKhodI0zdtaOxE83O8FME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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