Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12a0fa44aa10507276e9339b3a0041cea51eee749076ee3656a5821bb29521ee' 
  AND token = 'Zo7ZZ+/Lz7SnrXRKrTY+RQPUDaQvKCODhezQkviod/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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