Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9f38c4a6308b9a5a830bcbb14023f0c2572daa9e0c3bfc0ab9985f17b16e1f2' 
  AND token = 'VbSOb56rll1zFAqpaPne8VogVGHSdzOwYQcw0cS6YsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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