SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8e954836367d446a2dc9222ca86e4179a320946264eb5ff3a325e3dace5a511b' 
  AND token = 'jhGIJnw/QiuFSzNnGFeAAJZsUtj6BV7KPx2GAhABfVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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