Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '249cbda2823ec5f7c36dba44a1f8d4ade9fbed50f72bbffe89bcc9be065065a8' 
  AND token = '5e8pMRAJljsFyHRzwSxnSEoYRl0xRhb8DttIKcYhLRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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