Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c84e3680790abb29f9c6279a606c69533d63336ffde5d88cae97d90592b2f057' 
  AND token = 'tmv/0l4e16lDY43gyzS23BirKkeM7hdSqCXPG7fOox4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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