Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc93eb53658b381657d9a0fee94e81a7f17ebc07e00ca9c39ec3ba76e23459fb' 
  AND token = 'aIvYlrrRwje6I4qf+st2d1IVnpdt2m/e9oMs8YvLy/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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