Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3b52b89f76dfdbb0d7f282c5bf6764d75dcb0c13ee5408fa9802480944a8bd8' 
  AND token = '1J5ySJ4o5jz4xpdSVVwZj0gla93rsH4cXArzojHUi2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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