Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68622b0c580f3491872d210673976c63590db3982ecf9fcc405806ff3ac40013' 
  AND token = '0FbJSQjHU6ThibgLDe/byNWEka1lLwBO3HMm3xp3xkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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