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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5dc4ee60244cddb62c373cc345304d6a6de7e29feb43c9d4f23bcde00acb9a99' 
  AND token = '2FtRT/xfrcWzlp2A8zQkzJAdtyqEOzf/7StqeiVAX4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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