Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6444f87ea9b4e5dba8a5990c22b5e113fba23c6b176ea270f36d71f097f9cad' 
  AND token = 'UX4TBBXBDTf3kUNJmXJt1xwHRBGTkyIHgCdNe0FpV+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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