Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b510e38da3d4906374ad87d03f85caaae46920a774e216d6e7e3bba6e908215' 
  AND token = '+Vjar4ktCzND28EebSQPmwLfWXqxJE2184zKjj/B5OI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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