Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01cd3ec98647ab89d07773714ca5fd481199b078233b678914b83461d1804635' 
  AND token = 'FX+DM4S8NOUDhrhuCnMlUsA5sM7GtFRg16SScwHKMwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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