Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0dc9677d7f7d7684c48f2d9e5a8914968c303dd3a4a1dddba816bb3a02470310' 
  AND token = 'urmqh60YsWtVmVU0ORZg3CQWjBufWqNQoS7IdQuWiCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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