Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f1f0745e98c49f441332f117df387bee4f8ffb5c25bd6a3e9f52ef1e2a4b0fa' 
  AND token = 'xtHNyLsr1ByXVUrKW9hdmMCxtR0p8EjgZor7udQAPhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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