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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '63d3eb854d0e1b6ce179eee04c7ac508385b98af81d54ca64c900cea54981c06' 
  AND token = 'cbG8x5CqSObQ0I1i0wR1Ep9S6LPa3uteG9Wib56AFrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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