Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68550fe09f3ccf5af57e61b743683ab027f0eb9f3283bfbc572b9ed238fac0a3' 
  AND token = 'VWdQi+RsprPbns0LMEqCqmJCqzVOXrwcs7SaG/Zum0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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