Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76e4bfb370f7cd6442c35b744de44fc8d5a9e7ada4cd6692e3781eef48304829' 
  AND token = 'ovutwQZJexz79Ma68+hDJhIjhnf9HyyTDkrsKWGR/TQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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