Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12a8527f446e3c5005beb76274b15e534357c400d7b51e48d26ca9b9f09deeb2' 
  AND token = 'rZa3h/4WJOlEBPn5SsxhReqm81bl/ffBGjhCACnZsto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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