Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00519b9bbfa0f0ba37c707c21a0bc87b5c7bde5451b3a663758de6700ef413f0' 
  AND token = 'pxRR0Lj83PaXauA3sQn6cStGKn2p3EOr9QpkBeKgplI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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