Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c33a5021272afcfe758f455b46137b8449bd946a470036c973acaa3652ac5ca' 
  AND token = 'XpgN5IdhatSWN0te2e4wJa+ni7IhWqNpfhswAcneZE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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