Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42ab54f3e8f1e7024947d2f4c864aa8deec8b978fb5197d3b96fb76cf4ba9e56' 
  AND token = 'abHkA0cfRytt6bqILxBr5K8PNGTMs9Yy1Et4smhvKNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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