Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1a476e66c221a82f1e1b38b83e8d3e8188ce7e7f4eb52b3ec9a311fc11398ba' 
  AND token = '6+/0HBwe4kSLQKzt8GCvNNIJwGzg+NLZmIQOCgFwFJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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