Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0846a15389cfcd11c3b4a38738cfc0c4019793ae8ba4ff7ceae491b765cca7a' 
  AND token = 'IO4yd4G8pB5oR2mxMIr68rbXSyEUhvZF4S55mXMozog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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