Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92a49759a1974250de4a4b0432cc4f40682ed1fcc75c6ea452c56efef0562ddb' 
  AND token = 'YGyYxlLNzCiQ/YxzlEEZQAlKnVwk2yZyUSOaHvcJ0LM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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