Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f6f9e0073a9835ad3d79ebbdf76bed94c7ac70b96bd5fa3c9efa9a7442592c9' 
  AND token = 'd20lDRuNTUplJwcAxzP3VK09jbuahqJhNZ8zhNrnj/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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