Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b3b01f99b55db4e3c52e8d437230fa44df2f936f4e8c8d59b451ecadd1bb0a3' 
  AND token = 'AjehmCo/9kehZvY3DD6nI25odrq09TANRxUhPLUqEjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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