Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe7b4718e3aa679b5aea15dc2e4ff53ee441928c323a6ed21de05a9a3fe488ef' 
  AND token = 'GD385JxRfZtqZLxJd+ud5yy84M/NRED9MsHjG24jOR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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