Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbfbb9eefff0543ead69ddb1b88984700e42b5cf650bfe9b02646aa6b347e21d' 
  AND token = 'bBrtGlByfbu1SoGNoyT/vMjTTueCOI4LXnl/5grTjcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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