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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dd2f5eac0742ee7fc0cd9fcd6fa030403879491bc00b47b2ad7fc126e49d38f5' 
  AND token = '4MxdXUonf9R+EX0FINEKW5U/nqjcJd4WIa3HUyZKl9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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