Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbe7ff7b27a4164cd64f9f366538297d9b8421831eddfb3a9797f2ac33963c8b' 
  AND token = 'Hr7bhmJqlnMGDz/3q9G9MVal8VR9Hx7RYqeh1Vcp1ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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