Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c24b0d464356d6f59cbd2f36043530bcf521fcaa4d423d2008ed562ecdb1ca6' 
  AND token = '0Z48NWGxICW7yIFwQN5JVvOvipnUkSFHW3WTJaumCAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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