Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcfb80c4fa6ff161d6fbe49bbcf00c4cbd7fc37da1429319e8da02feb9524b19' 
  AND token = 'nz3bd6pIuh4VymtoGNVoIMHNOHUEUKnfQLxtj6NpWys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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