Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9116365b6985ed23f8d72cb55703f4bae2c801a35c66ca573c21ed90b8090c0' 
  AND token = 'ImIeMbMQSWy2gjmmceEkRzwGz3axmM+uxK0O61b2nQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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