Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9d3a2d7b4e93840ddcd79b3a6bf0e6de63aa07da5f5c4ae5863f66968c6cadd' 
  AND token = 'L9BrV3hrWm0mLy8AYxKB+wNddYvMm6/JVExAYHrB37U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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