Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a225ae0938b5d70cc6b80348efaed553466d9f8bd6f5663d78aa6f79fbc20b5' 
  AND token = '9AxSOVSmb2JmM3+/sbbRTgQDPR1FcwBkg2iigeyqR8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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