SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '82082516231fd7213a4847eb58fbe7c15ef1f221f30a04f69028a4aac4152cb7' 
  AND token = 'X3fBf8mDqOQhq9C4Z1kyKCqjpvpMMizYg5Fc9EN6ves=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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