Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eecfd6296398ef467b56ded9e120eda4243e19e97bdebabf755ec73dd0454097' 
  AND token = 'gPgdljl6ijO1Fub3U4mfcjwDyquycysTiEL9SyNnyk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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