SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3e1369c0e60be31f1b8f5b16649e8c98836df02d731a83c5acb7dae43615c45d' 
  AND token = 'i2GavBayNgWV967Mg/fSDu3LV8BZ7E+KRKrCSPOlCzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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