Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9dd7ae1821e1e438ede833ac9f3064ebce0a9113992f63bdc4b0fe333d613a1' 
  AND token = 'zBR1uFmSazs8KeJ6y4Q52QW/QowEJbZ4qKzx1yADBQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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