Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '683368a012f104e6fbb5cd52e7bc64310db6c3ef1bffea1c232a1f750767fe0c' 
  AND token = 'O7tRKXEpP+HiTfo+QCYa4X+ftS2KHK6Cx0J5uHaU1k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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