Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20ba6ddf49cac0e2ad9c8ad5813e1d4705d4c7daaa5bf4141ea882dae24a637b' 
  AND token = 'rZmlSH5EzlwMHGmRvt6ONqtYUDwlrNsRTq9vPHKuUsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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