Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3ea3546e7bcc8ce83741fcd113eca85d79543a788c8aae66874f3e2b89ad9a82' 
  AND token = 'mKpbzDo7V5RtFkAaBqhh+K4/P0pXuS/o/TWFO6M/jIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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