Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d5f76dc73f07de8eac89434dd4b2eaed2ec01ac07bf0408c24caa5dd3bc0d41' 
  AND token = 'vUVXrNhHCbeqyxgd0u9aqWOd10Dtg937/0r3lyI4cgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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