Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8af2406e6cffdb6fbd781f9765b93a331d50ab590a57ce49d9d72100172d3c8c' 
  AND token = '7vjlRLYrhoxp+fiz6SXauDawbRHTYnXPyz4dsEFb87Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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