Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e020ef9d99b02d9b82b4aa4fafd66f7d0c876e5bc23e694dc11ff0dab1cb1b9' 
  AND token = 'INkucvmdu6Ywm3xkb/HQQVH8jY4DBSYeomvrFTwXDnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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