Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7ae5685bbd855dfe5735525cd3c82856a2f85f3b9558e9140fbdb3f52a08e50' 
  AND token = '3n/XI9hT9g7D0wGWyBx6IZ/q3jIApxisdUdTQ1g5O+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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