SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cb4f230671dff90edce7add20b59d63f73ca2188ce061704108941ed63a18a56' 
  AND token = 'CErl8mCfNPNpXQkzO7w5e05/SVBsK2YVVh2bk2n9aB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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