Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f91eb229eb8d7c414985e21a3c82ba3e85985d27937350cf48f606665210de9' 
  AND token = '+ALsbRs3OLlaPXt+7B//JIlAnkCvYIHDA2hQmyPWass=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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