SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bdb5e938b9e0ca4d7f106b0909bc8c840cad73076d029ac2c3470e873d2f742c' 
  AND token = 'ozYg0YmPI9ZjJy/LyzbCAvqWxJf66Pdkc570wEyNPKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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