Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c7cd75cbc028f24c09333236711dcc5da9cfa214b8a63d2dbfbc37cd968817a' 
  AND token = 'j3VZthKHtCsY35smtzQyoRi6GtiELRmxeymG1XgWYUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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