Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb1355b8d69fd489e281f70bc0b0ef5a122e2b189091902bab93b29ca701258d' 
  AND token = 'E0JZoFq36rrgm/E+y772jqgBTF1dJyPVSzq/iOYii0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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