Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0fa1ce99a53dc968695fec4d863fdda5ec7d48086898423933c55e2369740a8' 
  AND token = 'URzj/OZxafORnmmIn4/qJPPpXw9GfAghp78vOUXEPcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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