Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bccf36ac94eed98e2eaaed8fe641e466cf8671f5d6dec82c7d9a11c69c1aaaf9' 
  AND token = 'f83Oak+Fu7bSGTLBtzVupf3DE5F3l8viAWcw+phoVK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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