Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5cc3fa93ddc0e3c4daa83210fa2eae3ec3ef7e47006519fe5791a205101fa321' 
  AND token = 'HTF1yZoNhYUnUsYWRU5QpV/a5Y8ltdG5ysDqk66hfBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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