Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5b1dcdba34863e435d690e0a951ae2ce1d1b947d97ab7ae09aee4355153522e' 
  AND token = '+k+OLe9SfBYDVv6FOyIQT80YVMw9KMf7lsj5n8ptyBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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