Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd3f1205dc7015f4af1208e76da2d35754907d2dc6aaea084511d14295503cfd' 
  AND token = '/oIiIqmFk52M5x+bRIh2NN09gfTwbuuFzElRBdBS8aY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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