Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd57d8fcbd0151e07c7abfcf9604c3f9f4926c56184c75a3c1a721d5c783488b' 
  AND token = 'gS1/rc7ITTleBy5FcSJQlmLNO/HpkDNidm7vCOchEBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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