Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '269337352539f442bc68dbe794331251a7674bca61ebeca75ca7dc42407ccf60' 
  AND token = '7tHRinWb00jf/eLLYNy60gijbEdD+VBHBYUTdTx0uqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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