Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3ff41c6bca39cc48efa8974a1cf3f959aa79d5a9783205278aa518c91eebe89' 
  AND token = 'O6rql+AMj29YD3M5aRSg9F9u1TABWknjstE4Tzr3s6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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