Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d9b504167f3fc383f3a3380f301b00f7f6dfd73368b6ac55dee905afd02f701' 
  AND token = 'briVToxK5vCITuZtfsK6pqG+W5lRRpbgTMPiL7yTXDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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