Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21dcee5371f7a45be57576b8e3c05b938cb8e3e7d8b5f5cba5eb26e7287bf9fb' 
  AND token = 'h0zqU23FsEgrKdf6g2PplM/FAvU3/OSvkL70hJBkLs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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