SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ebb317ef77e4da3d7b5216a05af189f4134828e5a56f09280386e18d832abdc7' 
  AND token = 'G3rR9vjWBbpErqRzDWHWNhDN4syfU01Ov/yx0APNXgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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