Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '200edd0fc9a59063dbd70b65fa83d4e8934f653fae8ce240d3424b5c4856c1cf' 
  AND token = 'tnte0BEOiW0ZYlwhKyj7mix/jZaz+ACgZecs18nui50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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