Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e4f82c1c20809c9ca58ef2a55e58edbaaa5a75cbedb1b3829d6258a2244ba1f' 
  AND token = 'olOziWqCpZKthLJ7OsLNXLE58SeAsK05xDctninOdxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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