SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c88314aa01a576b4829e5581491eb4129f9ddc07f96a5f4202850cf396932169' 
  AND token = 'IDRuvCVJ8oW1NVI2XE6BP4eiGhbE8J1KZevgtxLIXHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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