SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '11127b4e546d4f120b246214d10585a9e155c6b0dca0ad076e945054bb1646f9' 
  AND token = 'XbvF3l0VxuY+DwZ8VNGkwxF0nqd2+K0twdhkU/yCstU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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