SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6553e54881a44ac56c4bd31e044c50ad798d4a36023f6e582a89957bb97e0a62' 
  AND token = 'YLDIlHjlsT5RlfQLnqUNj8J9Sg/L3OcQPzzNCXF7VqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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