Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c2760bd398db48a021e3b9242b889c7cdb0503a7e5059355d84909b75d7a71c' 
  AND token = 'LypLtyWoDHShiNbJn5REqoalk3lEY2g0MUaM7zVAIqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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