Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6c3e483e51ff0d912247d6692e817f78e7bb50978b39f52853168f52d810642' 
  AND token = 'Kgixt6F72PdjdVfYWKEqyB5SEsJhJ6PA9QC1T62C0pU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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