Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe756154014a4fc8d44e4b580ce46530d7e7c1f18b2239ac233bffee4ae31db9' 
  AND token = 'UU1ak93929Rr2DlrMieOuoh0AX9poGN7989ihCtDQNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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