SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8ca45f3022b4b8d4a6728fd29953c0ebc35510ae54a02384734ab8ad0bda98f6' 
  AND token = 'yV7SSWI1w/HBMOKZJjPjc2d0CfgbK+gGhsMhXYqmWv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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