Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '028c88139c1e9fe6df80d06056a4cc15d8a8bfce4008d2a6f53652ea07d62e56' 
  AND token = 'DEbrpjJPt/q6OVhrSfpD+4xqvY0YuNQdsKWeVFOV/wY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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