Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '158fbe6732d49ba1351412a2f793526f6ee08268daa0feb2b1c82c06cb2e0cb5' 
  AND token = '7UMZ/eAQDOWjNr2ytyxmCKNgLXk+4zdJcbFn3hcDQ7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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