SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '949977d3f675c211f0d53af679f1a6e9b820f83307f3cf29568abe7b14dcac3f' 
  AND token = '06BUgP84ruQDIJykYChMHSD84esqWZvwrqEV5RarZl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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