Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4c61a419a0ba691ece5f09c27935f37093475128a226a679d896ebe2f89909a' 
  AND token = 'e+vkrqhyqI9OHXbLjKb4e1ikMNTDli+SnsupCFaA5HI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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