Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8dfca89f3ccfbe8298954ef7c4f25903fce4c3b924ce38f0dfc706bd1f931f9' 
  AND token = 'CSs5o2YWZwz10Gg7qxgcN6wkQqsa/Z22xhj9qwvGNBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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