Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1919150ff7169b06695adfad45a91f86f3a1c5b31cc4d4d022667aaef253ca9' 
  AND token = 'wqqGKcogiAoPM8Ypj6FWl3aY2IhB2KaRHceb/7M9Mwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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