Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0294a73e803c825cd81acb74eebd7724342e42c2e15766f495b23493e23f5d42' 
  AND token = 'JVQise45+1cVNDUkiHigMk2YLwpYvfQfbpzQPTplzFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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