Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8caca00efc451fdc7180d42690dd617591581ab88d69a096a820d3a2bfe531d3' 
  AND token = 'Yny2aSD7DeMDOp7+ZCmzd/SBhov5LmCz75rI0/wikvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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