Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0a2083664c3999ccf7eebf34d661342e1a5af202b0b5293ba511bf6ffaecf37f' 
  AND token = 'EYZDUHcK9LZr9C/EP0LyqeLh9HdE3EifkHuj+wuiMLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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