Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a71ea280f7bf0e8b83a8198b5b0d898f48c9eafc3497e5f586dfbc8fd5efc04d' 
  AND token = 'L/Rbb6tsReLufxTcslTlys7RIOerYDdhMvApxDVNJEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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