SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '36e8119434c1c2ce2f603582f5108ac700f84997adeb922989a2c42e407d7f95' 
  AND token = 'qowu6WqKMm3pAV5cipv7Yax/I+3JZJENlX2cGZcGDFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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