Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ba3aa653a4b3342843a351795f463ab78b712a25514f15482b3cc07e4606fcf6' 
  AND token = 'IyM1ZC4AJgbfR24Gkq5omUcxA/p6gcrGIGO0XA5+WRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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