Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9408cf8876389a7a4a77cfef94d381494219b76a70e098275205cb31bae63fa' 
  AND token = 'n/RCsHH5ZXI9ZF5ni/x6xXs/2YRu0zfeMSY+eMtE9E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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