Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccc6011b3b10ba83136fa65203d686f52f516d54c1e5695c8c0335be8f74910a' 
  AND token = 'e4CfPvsy8aJ6mz4fcc7ydcD6vknQ6yupAeYvTubcOqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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