Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad63f62cdd6a50b9234af72f1b8c87f99400987b616d42a3aa64eba11af0d644' 
  AND token = 'ZVtE8qcSZx1YzGC7JYg7dcDqUR1p69TqJG5uzct0Xvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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