Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed40f0763f45caff467f5e499f7a8acd72ebbb2cc3d2e9c2c1f664bfe8dfa886' 
  AND token = 'QnwUh2MYMNaz0m7QEJtyITck28UpJdPmDnFQPJI+vTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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