Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9c45e889a33110f859b4e92eb857744e225dc0a2f3c6c7b19f10bc0327a9e30' 
  AND token = 'kbYLNAqpzmdEwI8etPK0WSCzyj1IV9GoUOxbLtk4OTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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